|
gptkbp:instanceOf
|
granite
|
|
gptkbp:associatedMinerals
|
gptkb:albite
quartz
lepidolite
spodumene
|
|
gptkbp:birefringence
|
0.018–0.021
|
|
gptkbp:category
|
tourmaline group
|
|
gptkbp:chemicalFormula
|
Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
|
|
gptkbp:cleavage
|
indistinct
|
|
gptkbp:color
|
blue
green
red
yellow
colorless
pink
multicolored
|
|
gptkbp:crystalSystem
|
trigonal
|
|
gptkbp:firstDescribed
|
1913
|
|
gptkbp:fluorescence
|
weak or none
|
|
gptkbp:foundIn
|
gptkb:Afghanistan
gptkb:Brazil
gptkb:Madagascar
gptkb:Mozambique
gptkb:United_States
|
|
gptkbp:fracture
|
subconchoidal
|
|
gptkbp:habit
|
prismatic crystals
columnar aggregates
acicular crystals
|
|
gptkbp:hardnessMohs
|
7-7.5
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Elbaite
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:namedAfter
|
gptkb:Elba_Island
|
|
gptkbp:opticalProperties
|
uniaxial (-)
|
|
gptkbp:pleochroism
|
strong
|
|
gptkbp:polarization
|
piezoelectric
pyroelectric
|
|
gptkbp:refractiveIndex
|
1.624–1.644
|
|
gptkbp:relatedGroup
|
cyclosilicate
|
|
gptkbp:specificGravity
|
3.0-3.1
|
|
gptkbp:streak
|
white
|
|
gptkbp:tenacity
|
brittle
|
|
gptkbp:transparency
|
translucent
transparent
|
|
gptkbp:uses
|
granite
|
|
gptkbp:bfsParent
|
gptkb:Cyclosilicates
|
|
gptkbp:bfsLayer
|
7
|